1、 ATIS-1000036 pre-pub Pre-published Technical Report on - Next Generation Network (NGN) Operator Services Standard Prepared by PTSC-SAC NOTICE This document is a pre-published Technical Report of PTSC. The document has been approved by PTSC. The document, however, has not completed the editing and p
2、ublication cycles. As such, this document is subject to further change. ATIS and PTSC expressly advise that any use of or reliance upon the material in this document is at your risk and neither ATIS nor PTSC shall be liable for any damage or injury, of whatever nature, incurred by any person arising
3、 out of any utilization of the material. The final version of this document will be published as ATIS-1000036. ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and co
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6、 contributor to the International Telecommunication Union (ITU) Radio and Telecommunications Sectors, and a member of the Inter-American Telecommunication Commission (CITEL). For more information, please visit . Notice of Disclaimer the information and parameters required for this service are only a
7、vailable either within a trust domain or between trusted domains. In addition, in the absence of trust, and depending on exactly which information is not trusted, basic call setup may not function as expected.ATIS-1000036 2 Table of Contents goes here 1 Introduction Network signaling in support of O
8、perator Services in the SS7 PSTN are standardized in ANSI T1.666 T1.666. That standard describes a network capability. That is, it describes processes for setting up a call from the caller to the Operator Services System (OSS), transferring the call from one OSS to another, and completing a call fro
9、m an OSS to a called party. Additional specialized functions are described for connection hold (preventing the calling party from disconnecting), network control of a coin phone, and network service recall (returning control of the call to the OSS after the end of a call to a called party.) T1.666 d
10、oes not provide a detailed service description from the perspective of the calling party. This standard similarly does not provide detailed service descriptions for Operator Services. Rather, high-level descriptions of the basic set of Operator Services are given and the signaling protocol elements
11、required to support those services at an NGN-based OSS are described in detail. Illustrative examples are provided to show the transfer of needed information from the calling party to the OSS and from the OSS to called parties (e.g., for Call Completion service.) The service logic associated with de
12、termining which Operator Service to provide to the calling party and the service-specific interactions (e.g., access to databases) is not described in detail. 2 Scope and Purpose This standard describes signaling support for Operator Services when the application providing the services resides in th
13、e NGN. The services within the scope of this standard include: 1. Directory Assistance/Directory Assistance Call Completion 2. Operator Assistance 3. Transfer to an Interexchange Carrier 4. Call Completion 5. Person Handling (Person-to-Person Call) 6. Calling Card and Commercial Credit Card (Alterna
14、te Billing) 7. Collect or Reverse Charging (Alternate Billing) 8. Third Number Billing (Alternate Billing) Network control of a coin phone is out of the scope of this standard. Intercept Service (providing information to the calling party regarding a number which has been disconnected or changed) is
15、 for further study. Busy Line Verification Service (verifying for the calling party that a called number is not out of service but is busy) and Interrupt Service (bridging an operator onto an existing call between two parties to alert one of the parties that the calling party is attempting to reach
16、them) are also for further study. The scope of this standard includes: 1. SS7 to SIP interworking for a call originating in the PSTN and directed toward the Operator Services System (OSS) in the NGN. 2. SIP signaling for a call originating in the NGN and directed toward the Operator Services System
17、(OSS) in the NGN. ATIS-1000036 3 In addition, this standard describes the signaling for establishing a call/session from the OSS to a further destination, noting the similarities to normal call/session setup signaling. Interconnection is assumed to be between trusted domains; the information and par
18、ameters required for this service are only available either within a trust domain or between trusted domains. In addition, in the absence of trust, and depending on exactly which information is not trusted, basic call setup may not function as expected.ATIS-1000036 4 Signaling to establish a call/se
19、ssion from the NGN to an OSS in the PSTN is not addressed in this standard, though ISUP/SIP interworking as described in ANSI T1.679 T1.679 should provide the needed functionality. 3 Normative References ATIS-1000005 ATIS-1000005-2006, Technical Report: Service Description of ETS ATIS-1000018 ATIS-1
20、000018-2007, Technical Report on NGN Architecture ATIS-1000009 ATIS-1000009-2006, IP Network-to-Network Interface (NNI) Standard for VoIP ATIS-1000011 ATIS-1000011-2007, Technical Report: ETS Packet Priority for IP NNI Interfaces Use of Existing DiffServ Per Hop Behaviors T1.666 T1.666-1999, Signall
21、ing System No. 7 Operator Services Network Capabilities Technical Report: Operator Services in a Next Generation Network T1.679 T1.679-2004, Interworking between Session Initiation Protocol (SIP) and Bearer Independent Call Control or ISDN User Part ATIS-1000027 ATIS-1000027-2008, Technical Report:
22、Operator Services in a Next Generation Network P-Charge-Info draft-york-sipping-p-charge-info-07 SIP Diversion draft-levy-sip-diversion-10 Editors Note: These references need to be updated to the latest draft or to the agreed document when this standard is published. SIP-History-Info RFC 4244, An Ex
23、tension to the Session Initiation Protocol (SIP) for Request History Information 4 Definitions and Abbreviations ACM (SS7) Address Complete Message AS Application Server BGCF Border Gateway Control Function CIP (SS7) Carrier Information Parameter CSCF Call Session Control Function CSI (SS7) Carrier
24、Selection Information EO End Office HSS Home Subscriber Server IAM (SS7) Initial Address Message ISUP (SS7) ISDN User Part MIME Multipurpose Internet Mail Extensions MGCF Media Gateway Control Function MS Media Server ATIS-1000036 5 NGN Next Generation Network OBCI (SS7) Optional Backward Call Indic
25、ators OLI (SS7) Originating Line Information OSI Open Systems Interconnection OSS Operator Services System PAI P-Asserted Identity PSTN Public Switched Telephone Network RFC (IETF) Request For Comments SAP (SS7) Service Activation Parameter SBC Session Border Controller SDP Session Description Proto
26、col SIP Session Initiation Protocol SS7 (ANSI) Signaling System 7 TNS (SS7) Transit Network Selection UE User Equipment URI Uniform Resource Identifier 5 Service Definitions The definitions in this section are based on specific PSTN operator services and describe these services from the calling part
27、y perspective. The definitions also apply to a mixed PSTN/NGN environment, where the calling party may be in an NGN and where the operator services system (OSS) may be in an NGN. 5.1 Directory Assistance/Directory Assistance Call Completion The telephone number for a given name and address is provid
28、ed to the calling party by an OSS. Call completion to the telephone number is an option available to the calling party. The OSS can complete a call for a calling party to the directory listing number that is found. Operator recall returns the calling party to the OSS when signaled by the calling par
29、ty. In the PSTN, Operator Recall may be signaled by depressing the flash-hook. NGN terminals are not expected to signal the hook-flash. Therefore, NGN signaling for Operator Recall is assumed to be network-specific and is not described in this standard. 5.2 Operator Assistance Dialing instructions a
30、nd rate information are provided to the calling party by an OSS. 5.3 Transfer to Inter-exchange Carrier Based on the interaction with the calling party, the OSS progresses the call into another network. The call appears to the other network as an incoming call to that networks OSS. 5.4 Call Completi
31、on The OSS completes a call for the calling party. The called number may be determined by an operator service (e.g., Directory Assistance), or by the calling party alone (by providing the called number to the ATIS-1000036 6 OSS.) This service includes an optional feature (Operator Recall) to return
32、the calling party to an operator when signaled by the calling party. In the PSTN, Operator Recall may be signaled by depressing the flash-hook. NGN terminals are not expected to signal the hook-flash. Therefore, NGN signaling for Operator Recall is assumed to be network-specific and is not described
33、 in this standard. 5.5 Person Handling (Person-to-Person Call) The OSS completes a call for the calling party. In addition, before the calling and called parties are connected, the OSS confirms that a specific individual has been contacted, rather than just the requested end user equipment. 5.6 Call
34、ing Card and Commercial Credit Card (Alternate Billing) The calling party requests that the call be billed to a calling card or commercial credit card. After verification of the card, the OSS completes the call for the calling party. 5.7 Collect or Reverse Charging (Alternate Billing) The calling pa
35、rty requests that the call be billed to the called party. The OSS completes the call for the calling party. In addition, before the calling and called parties are connected, the OSS confirms that the called party will accept the charges for the call. 5.8 Third Number Billing (Alternate Billing) The
36、calling party requests that the call be billed to a third party. The OSS places a call to the third party to confirm that the third party will accept the charges for the call. After this verification, the OSS completes the call for the calling party. 6 Architecture Model The network architecture tha
37、t provides the context for Operator Services is taken from ATIS-1000018 with the assumption that the Operator Services System will be a part of a Voice over IP network. For completeness in describing the PSTN/NGN gateway, a PSTN-based OSS is also shown. ATIS-1000036 7 OtherIPNetworksASP-MwMwMxMrMiDx
38、Sh/SiRf/RoPSTN/ISDNMiUEMgMjGmISCCxDhIcRf/RoCxIbIwIdPSTNMGCFI-CSCFHSSS-CSCFMRFCMwSLFCharging FunctionSGFIWFI-BGFASIBCFMRFP T-MGFP-CSCFMSA-BGFPSTNGWBGCFSIPH.248DIAMETEROtherMRB*PDFGqGqSB*S/I-CSCF* Specialized AS* Also known as a SCIMNote: PDF interfaces between two interconnecting networks are not sho
39、wn.MpGoMnRf/RoRf/RoRf/RoMxDxInter-connectSBCAccessSBCA2A13rdPartyApplicationsANIFigure 1 ATIS NGN Functional Architecture With its focus on the operator services AS, this standard does not address the Access SBC, Charging Function and HSS. Therefore, the effective functional architecture for purpose
40、s of this document is as shown in Figure 2. callingVoIP PhoneVoIP service providerNetwork dbASMS1dbOSS(VoIP)data networkdataVoIP accessnetwork AMSKVoIP Service Provider BNetworkAS-BMS1BOSS-B(VoIP)MSKBPSTN GWPSTNOSS(PSTN)calledVoIP PhoneVoIP accessnetwork BMRBCSCFMRBAccess SBCAccess SBCInterconnect S
41、BCInterconnect SBCInterconnect SBCCSCFdbI-SBCI-SBCSignaling and bearerdbdata networkApplicationGWcallingVoIP PhonecalledVoIP PhoneFigure 2 Operator Services Architecture In Figure 2: ATIS-1000036 8 Either “VoIP access network X” or the PSTN is the network where the call to be directed to the Operato
42、r Services System originates. Either “VoIP access network Y” or the PSTN is the network where a call is delivered from the Operator Services System (e.g., for Call Completion service.) “VoIP Service Provider A” supplies the initial contact with operator services. “VoIP Service Provider B” provides o
43、perator services to the calling party if and when the call is transferred there from VoIP Service Provider A. Internal functionality within the Operator Services System is described in ATIS-1000018. 7 Information Elements This section describes the information elements needed for operator services p
44、rocessing which are conveyed between the OSS and other network entities. These information elements are carried in the SS7 ISUP and NGN SIP messaging described in this standard. For PSTN originations, information elements mapped to SIP headers will be included in any encapsulated ISUP. Per T1.679, i
45、nformation in the SIP headers has precedence over encapsulated content when there is any conflict between the two. 7.1 Information Elements in Forward Direction Toward the OSS 7.1.1 Dialed Digits The Dialed Digits information element is applicable for PSTN and NGN originations. For PSTN originations
46、, the MGCF recognizes the call as directed to Operator Services (e.g., by incoming trunk group or by referring to the received Operator Services Information parameter for send paid calls) and populates the Request-URI accordingly. Thus, the Request-URI may be populated with an operator-services spec
47、ific domain name (e.g., for dialed digits “NPA-NXX-YYYY” recognized as destined for operator services based on the incoming trunk group, “sip:NPA-NXX-YYYYOperatorS; phone-context=+1;user=phone“ or “AlternateBillingOperatorS“). The original dialed digits (including any prefix digits) are provided in
48、SIP History-Info and Diversion headers. The information is also passed in the Called Party Number parameter in the encapsulated ISUP. Alternatively, the Request-URI may be populated such that if the IAM includes an indication that the user dialed an initial “0” (Operator Services Information paramet
49、er with a Information Value Type = 001 (original access prefix) and Information Value = 0010 (0+ or 01+) or Information Value = 0010 (0-), then the “0” is included as the first (or only) digit of the called number. For NGN originations, the callers AS, on recognizing that the dialed digits reference an operator service will retarget the call, providing a Request-URI that is specific to the particular Operator Service (e.g., “sip:NPA-NXX-YYYYOperatorS; phone-context=+1;user=pho
